Here is the little bike that could. eJoe Bike?s E-Transformer S is a folding bike that can take you up to 30 miles on a single charge, and then fold down to half its size for easy storage. Commuting to an office? You can store this bike in your cubicle until you?re ready to head home! The E-Transformer S is equipped with a 250w lightweight motor and a 36v lithium-ion battery. It?s a durable, low maintenance bike.